Run results for: undefined vs. typeof vs. in vs. hasOwnProperty - v2 - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/108.0.0.0 Safari/537.36

Browser: Chrome 108

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
undefined	2413033.8 Ops/sec
typeof	6924113.0 Ops/sec
in	6794395.5 Ops/sec
hasOwnProperty	6192549.5 Ops/sec
bool	6782133.5 Ops/sec

Script Preparation code:

var obj = { a: 1, b: 2, c: 3, d: 4, e: 5 };

Tests:

undefined
undefined !== obj.d && undefined !== obj.f;
typeof
'undefined' !== typeof obj.d && 'undefined' !== typeof obj.f;
in
'd' in obj && 'f' in obj;
hasOwnProperty
obj.hasOwnProperty('d') && obj.hasOwnProperty('f');
bool
!!obj.d && !!obj.f;

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